القرآن شفاء عام
The Qur'an's own description of itself as a source of healing — the foundation Ibn al-Qayyim builds on before discussing any specific ruqyah or physical remedy.
وَنُنَزِّلُ مِنَ الْقُرْآنِ مَا هُوَ شِفَاءٌ وَرَحْمَةٌ لِلْمُؤْمِنِينَ
“And We send down of the Qur'an that which is a healing and a mercy for the believers.” (meaning, not a literal translation)
Distinct from the specific narrated incident behind the existing 'Ruqyah with Surah al-Fatiha' entry — this verse is the general principle those specific narrations are built on, rather than describing a particular event or a single chapter's use.
Ibn al-Qayyim opens the spiritual-medicine section of Zad al-Ma'ad by arguing the Qur'an is the most complete cure available, addressing diseases of the heart first and, by Allah's permission, the body as well. He structures much of his broader medical writing around this claim — treating physical remedies as real and valuable, but subordinate in his framework to the Qur'an's role in addressing the heart's diseases specifically.
As a matter of religious doctrine about scripture's spiritual role, this isn't a claim modern medical research is positioned to test — it sits outside the domain of physical mechanism that scientific study addresses.